A Family of Bipartite Graphs

In this problem, we study about Range Graphs - a special family of bipartite graphs. A bipartite graph with $n$ vertices on the left part (numbered from 1 to $n$) and $m$ on the right part (numbered from $n+1$ to $n + m$), is said to be a Range Graph, if each vertex on the left satisfies the following property - the numbers of its set of neighbors should form a consecutive range/segment on the rig